A super Mario World prototype map from 1989, originally discovered as part of the Nintendo "gigaleak" of 2020, was recently de-corrupted by codfish1002.
Would you look at that – the Mushroom Kingdom looks like a mushroom. Who would have thought? It's obviously sparse, and also from a time in development before the game squarely took place in Dinosaur Land, but it's nevertheless a good look at some of the earliest SNES development out there, which clearly draws more direct inspiration from Super Mario Bros. 3's world map in the end.
We'll be sure to provide any additional fascinating glimpses into the Nintendo's history if we can.